It flies in formation with Capt. Lee Adama and a Viper squadron in the ship's decommissioning ceremony.
It is later called into duty with Capt. Jackson Spencer's ill-fated squadron during the first hours of the Fall of the Twelve Colonies. The ship is pursued by Cylon Raiders and damaged by shrapnel from a missile, forcing it to land on Caprica, ostensively on the furthest outskirts of Caprica City. Its crew make repairs, not expecting to serve as a life boat of a few civilians selected by lottery, including Gaius Baltar. Agathon remains on Caprica in exchange for the extra weight of Baltar, believing that Baltar's genius was more important to the survival of the human race.
After being rescued by newly sworn-in President Laura Roslin's caravan, 312 aids in finding other stranded civilian ships before rejoining Galactica at Ragnar Anchorage, thus establishing the Fleet (TRS: "Miniseries").
- Sharon Valerii and Chief Galen Tyrol use the dubious functionality of a "landing gimbal" from 312 as pretext for intimate relations (TRS: "Miniseries").
- When Tyrol refers to a Raptor which Valerii had piloted on 47 missions, he may be referring to either Raptor 312 (TRS: "Flight of the Phoenix") or Raptor 478 (TRS: "33", "Water"). It is unknown the reason for the change in numbers between the "Miniseries" and the "33".